epoger@google.com | ec3ed6a | 2011-07-28 14:26:00 +0000 | [diff] [blame] | 1 | |
| 2 | /* |
| 3 | * Copyright 2011 Google Inc. |
| 4 | * |
| 5 | * Use of this source code is governed by a BSD-style license that can be |
| 6 | * found in the LICENSE file. |
| 7 | */ |
reed@google.com | 83acbe0 | 2011-04-22 19:18:20 +0000 | [diff] [blame] | 8 | #include "Test.h" |
| 9 | #include "SkColor.h" |
tomhudson@google.com | 13e812c | 2012-01-18 21:28:01 +0000 | [diff] [blame] | 10 | #include "SkColorPriv.h" |
reed@google.com | 4b163ed | 2012-08-07 21:35:13 +0000 | [diff] [blame] | 11 | #include "SkMathPriv.h" |
tomhudson@google.com | 13e812c | 2012-01-18 21:28:01 +0000 | [diff] [blame] | 12 | #include "SkRandom.h" |
reed@google.com | 83acbe0 | 2011-04-22 19:18:20 +0000 | [diff] [blame] | 13 | #include "SkUnPreMultiply.h" |
| 14 | |
reed@google.com | 223d81d | 2012-10-12 14:43:28 +0000 | [diff] [blame] | 15 | #define GetPackedR16As32(packed) (SkGetPackedR16(dc) << (8 - SK_R16_BITS)) |
| 16 | #define GetPackedG16As32(packed) (SkGetPackedG16(dc) << (8 - SK_G16_BITS)) |
| 17 | #define GetPackedB16As32(packed) (SkGetPackedB16(dc) << (8 - SK_B16_BITS)) |
| 18 | |
| 19 | static bool S32A_D565_Blend_0(SkPMColor sc, uint16_t dc, U8CPU alpha) { |
| 20 | unsigned dst_scale = 255 - SkMulDiv255Round(SkGetPackedA32(sc), alpha); |
| 21 | unsigned dr = SkMulS16(SkPacked32ToR16(sc), alpha) + SkMulS16(SkGetPackedR16(dc), dst_scale); |
| 22 | unsigned dg = SkMulS16(SkPacked32ToG16(sc), alpha) + SkMulS16(SkGetPackedG16(dc), dst_scale); |
skia.committer@gmail.com | f57c01b | 2012-10-13 02:01:56 +0000 | [diff] [blame] | 23 | |
reed@google.com | 223d81d | 2012-10-12 14:43:28 +0000 | [diff] [blame] | 24 | unsigned rr = SkDiv255Round(dr); |
| 25 | unsigned rg = SkDiv255Round(dg); |
skia.committer@gmail.com | f57c01b | 2012-10-13 02:01:56 +0000 | [diff] [blame] | 26 | |
reed@google.com | 223d81d | 2012-10-12 14:43:28 +0000 | [diff] [blame] | 27 | if (rr <= 31 && rg <= 63) { |
| 28 | return true; |
| 29 | } |
| 30 | return false; |
| 31 | } |
| 32 | |
| 33 | static bool S32A_D565_Blend_01(SkPMColor sc, uint16_t dc, U8CPU alpha) { |
| 34 | unsigned dst_scale = 255 - SkMulDiv255Round(SkGetPackedA32(sc), alpha); |
| 35 | unsigned dr = SkMulS16(SkGetPackedR32(sc), alpha) + SkMulS16(SkGetPackedR16(dc) << 3, dst_scale); |
| 36 | unsigned dg = SkMulS16(SkGetPackedG32(sc), alpha) + SkMulS16(SkGetPackedG16(dc) << 2, dst_scale); |
skia.committer@gmail.com | f57c01b | 2012-10-13 02:01:56 +0000 | [diff] [blame] | 37 | |
reed@google.com | 223d81d | 2012-10-12 14:43:28 +0000 | [diff] [blame] | 38 | unsigned rr = SkDiv255Round(dr) >> 3; |
| 39 | unsigned rg = SkDiv255Round(dg) >> 2; |
skia.committer@gmail.com | f57c01b | 2012-10-13 02:01:56 +0000 | [diff] [blame] | 40 | |
reed@google.com | 223d81d | 2012-10-12 14:43:28 +0000 | [diff] [blame] | 41 | if (rr <= 31 && rg <= 63) { |
| 42 | return true; |
| 43 | } |
| 44 | return false; |
| 45 | } |
| 46 | |
| 47 | static bool S32A_D565_Blend_02(SkPMColor sc, uint16_t dc, U8CPU alpha) { |
| 48 | unsigned dst_scale = 255 - SkMulDiv255Round(SkGetPackedA32(sc), alpha); |
| 49 | unsigned dr = SkMulS16(SkGetPackedR32(sc), alpha) + SkMulS16(GetPackedR16As32(dc), dst_scale); |
| 50 | unsigned dg = SkMulS16(SkGetPackedG32(sc), alpha) + SkMulS16(GetPackedG16As32(dc), dst_scale); |
| 51 | unsigned db = SkMulS16(SkGetPackedB32(sc), alpha) + SkMulS16(GetPackedB16As32(dc), dst_scale); |
| 52 | int rc = SkPack888ToRGB16(SkDiv255Round(dr), |
| 53 | SkDiv255Round(dg), |
| 54 | SkDiv255Round(db)); |
skia.committer@gmail.com | f57c01b | 2012-10-13 02:01:56 +0000 | [diff] [blame] | 55 | |
reed@google.com | 223d81d | 2012-10-12 14:43:28 +0000 | [diff] [blame] | 56 | unsigned rr = SkGetPackedR16(rc); |
| 57 | unsigned rg = SkGetPackedG16(rc); |
skia.committer@gmail.com | f57c01b | 2012-10-13 02:01:56 +0000 | [diff] [blame] | 58 | |
reed@google.com | 223d81d | 2012-10-12 14:43:28 +0000 | [diff] [blame] | 59 | if (rr <= 31 && rg <= 63) { |
| 60 | return true; |
| 61 | } |
| 62 | return false; |
| 63 | } |
| 64 | |
| 65 | static bool S32A_D565_Blend_1(SkPMColor sc, uint16_t dc, U8CPU alpha) { |
| 66 | unsigned dst_scale = 255 - SkMulDiv255Round(SkGetPackedA32(sc), alpha); |
| 67 | unsigned dr = (SkMulS16(SkGetPackedR32(sc), alpha) >> 3) + SkMulS16(SkGetPackedR16(dc), dst_scale); |
| 68 | unsigned dg = (SkMulS16(SkGetPackedG32(sc), alpha) >> 2) + SkMulS16(SkGetPackedG16(dc), dst_scale); |
skia.committer@gmail.com | f57c01b | 2012-10-13 02:01:56 +0000 | [diff] [blame] | 69 | |
reed@google.com | 223d81d | 2012-10-12 14:43:28 +0000 | [diff] [blame] | 70 | unsigned rr = SkDiv255Round(dr); |
| 71 | unsigned rg = SkDiv255Round(dg); |
skia.committer@gmail.com | f57c01b | 2012-10-13 02:01:56 +0000 | [diff] [blame] | 72 | |
reed@google.com | 223d81d | 2012-10-12 14:43:28 +0000 | [diff] [blame] | 73 | if (rr <= 31 && rg <= 63) { |
| 74 | return true; |
| 75 | } |
| 76 | return false; |
| 77 | } |
| 78 | |
| 79 | static int SkDiv65025Round(int x) { |
| 80 | return (x + 65025/2) / 65025; |
| 81 | // return x / 65025; |
| 82 | } |
| 83 | static bool S32A_D565_Blend_2(SkPMColor sc, uint16_t dc, U8CPU alpha) { |
| 84 | unsigned dst_scale = 255*255 - SkGetPackedA32(sc) * alpha; |
| 85 | alpha *= 255; |
| 86 | unsigned dr = (SkGetPackedR32(sc) >> 3) * alpha + SkGetPackedR16(dc) * dst_scale; |
| 87 | unsigned dg = (SkGetPackedG32(sc) >> 2) * alpha + SkGetPackedG16(dc) * dst_scale; |
skia.committer@gmail.com | f57c01b | 2012-10-13 02:01:56 +0000 | [diff] [blame] | 88 | |
reed@google.com | 223d81d | 2012-10-12 14:43:28 +0000 | [diff] [blame] | 89 | unsigned rr = SkDiv65025Round(dr); |
| 90 | unsigned rg = SkDiv65025Round(dg); |
skia.committer@gmail.com | f57c01b | 2012-10-13 02:01:56 +0000 | [diff] [blame] | 91 | |
reed@google.com | 223d81d | 2012-10-12 14:43:28 +0000 | [diff] [blame] | 92 | if (rr <= 31 && rg <= 63) { |
| 93 | return true; |
| 94 | } |
| 95 | return false; |
| 96 | } |
| 97 | |
| 98 | static void test_565blend(skiatest::Reporter* reporter) { |
| 99 | int total_failures = 0; |
| 100 | for (int global_alpha = 0; global_alpha <= 255; ++global_alpha) { |
| 101 | int failures = 0; |
| 102 | int total = 0; |
| 103 | for (int src_a = 0; src_a <= 255; ++src_a) { |
| 104 | for (int src_c = 0; src_c <= src_a; ++src_c) { |
| 105 | SkPMColor sc = SkPackARGB32(src_a, src_c, src_c, src_c); |
| 106 | for (int dst_r = 0; dst_r <= 31; ++dst_r) { |
| 107 | for (int dst_g = 0; dst_g <= 63; ++dst_g) { |
| 108 | uint16_t dc = SkPackRGB16(dst_r, dst_g, dst_r); |
| 109 | failures += !S32A_D565_Blend_0(sc, dc, global_alpha); |
| 110 | total += 1; |
| 111 | } |
| 112 | } |
| 113 | } |
| 114 | } |
| 115 | SkDebugf("global_alpha=%d failures=%d total=%d %g\n", global_alpha, failures, total, failures * 100.0 / total); |
| 116 | total_failures += failures; |
| 117 | } |
| 118 | SkDebugf("total failures %d\n", total_failures); |
| 119 | } |
| 120 | |
reed@google.com | 83acbe0 | 2011-04-22 19:18:20 +0000 | [diff] [blame] | 121 | static void test_premul(skiatest::Reporter* reporter) { |
| 122 | for (int a = 0; a <= 255; a++) { |
| 123 | for (int x = 0; x <= 255; x++) { |
| 124 | SkColor c0 = SkColorSetARGB(a, x, x, x); |
| 125 | SkPMColor p0 = SkPreMultiplyColor(c0); |
| 126 | |
| 127 | SkColor c1 = SkUnPreMultiply::PMColorToColor(p0); |
| 128 | SkPMColor p1 = SkPreMultiplyColor(c1); |
| 129 | |
| 130 | // we can't promise that c0 == c1, since c0 -> p0 is a many to one |
| 131 | // function, however, we can promise that p0 -> c1 -> p1 : p0 == p1 |
| 132 | REPORTER_ASSERT(reporter, p0 == p1); |
reed@google.com | 75595d9 | 2011-05-03 21:27:49 +0000 | [diff] [blame] | 133 | |
| 134 | { |
| 135 | int ax = SkMulDiv255Ceiling(x, a); |
| 136 | REPORTER_ASSERT(reporter, ax <= a); |
| 137 | } |
reed@google.com | 83acbe0 | 2011-04-22 19:18:20 +0000 | [diff] [blame] | 138 | } |
| 139 | } |
| 140 | } |
| 141 | |
tomhudson@google.com | 13e812c | 2012-01-18 21:28:01 +0000 | [diff] [blame] | 142 | /** |
| 143 | This test fails: SkFourByteInterp does *not* preserve opaque destinations. |
| 144 | SkAlpha255To256 implemented as (alpha + 1) is faster than |
| 145 | (alpha + (alpha >> 7)), but inaccurate, and Skia intends to phase it out. |
| 146 | */ |
| 147 | /* |
| 148 | static void test_interp(skiatest::Reporter* reporter) { |
| 149 | SkRandom r; |
| 150 | |
| 151 | U8CPU a0 = 0; |
| 152 | U8CPU a255 = 255; |
| 153 | for (int i = 0; i < 200; i++) { |
| 154 | SkColor colorSrc = r.nextU(); |
| 155 | SkColor colorDst = r.nextU(); |
| 156 | SkPMColor src = SkPreMultiplyColor(colorSrc); |
| 157 | SkPMColor dst = SkPreMultiplyColor(colorDst); |
| 158 | |
| 159 | REPORTER_ASSERT(reporter, SkFourByteInterp(src, dst, a0) == dst); |
| 160 | REPORTER_ASSERT(reporter, SkFourByteInterp(src, dst, a255) == src); |
| 161 | } |
| 162 | } |
| 163 | */ |
| 164 | |
| 165 | static void test_fast_interp(skiatest::Reporter* reporter) { |
| 166 | SkRandom r; |
| 167 | |
| 168 | U8CPU a0 = 0; |
| 169 | U8CPU a255 = 255; |
| 170 | for (int i = 0; i < 200; i++) { |
| 171 | SkColor colorSrc = r.nextU(); |
| 172 | SkColor colorDst = r.nextU(); |
| 173 | SkPMColor src = SkPreMultiplyColor(colorSrc); |
| 174 | SkPMColor dst = SkPreMultiplyColor(colorDst); |
| 175 | |
| 176 | REPORTER_ASSERT(reporter, SkFastFourByteInterp(src, dst, a0) == dst); |
| 177 | REPORTER_ASSERT(reporter, SkFastFourByteInterp(src, dst, a255) == src); |
| 178 | } |
| 179 | } |
reed@google.com | 83acbe0 | 2011-04-22 19:18:20 +0000 | [diff] [blame] | 180 | |
| 181 | static void TestColor(skiatest::Reporter* reporter) { |
| 182 | test_premul(reporter); |
tomhudson@google.com | 13e812c | 2012-01-18 21:28:01 +0000 | [diff] [blame] | 183 | //test_interp(reporter); |
| 184 | test_fast_interp(reporter); |
reed@google.com | 223d81d | 2012-10-12 14:43:28 +0000 | [diff] [blame] | 185 | // test_565blend(reporter); |
reed@google.com | 83acbe0 | 2011-04-22 19:18:20 +0000 | [diff] [blame] | 186 | } |
| 187 | |
| 188 | #include "TestClassDef.h" |
| 189 | DEFINE_TESTCLASS("Color", ColorTestClass, TestColor) |